#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */


    int myadd(int a,int b);
    int mysub(int a,int b);
    int mydiv(int a,int b); 
    int mymul(int a,int b);
    int main()
{
    int ret1=mymul(10,20);
    int ret2=mydiv(20,5);
    int ret3=myadd(ret1,ret2);
    int ret4=mysub(ret3,30);
    printf("result=%d\n",ret4);
    
    return 0;
}
